Billlie's Tsuki recently shared a striking story from her trainee days that left the cast of SBS variety show No, But Seriously! speechless. The Japanese idol moved to Korea at just 13 years old and made an unusual decision: she asked her mother to temporarily stop contact so she could dedicate herself entirely to mastering the Korean language.

When comedian Lee Su Ji complimented Tsuki's Korean fluency, the idol explained the reasoning behind the extreme measure. Since neither of her parents spoke Korean, she felt isolated and unable to function as a trainee without the language. "I didn't even know when I was supposed to eat," she recalled, describing how basic communication was a barrier to everything from daily life to understanding lessons during training.

Tsuki told her mother: "I feel like I won't be able to survive here unless I really buckle down and study Korean. Please wait until I reach out to you first." For six months, she focused solely on her studies. The payoff was clear—she eventually became so fluent that Lee Su Ji praised not only her standard Korean but also her ability to pick up regional dialects.

Host Tak Jae Hoon was initially skeptical of the story, expressing disbelief that a young teenager would willingly cut off contact with her mother for half a year. Yet Tsuki's determination resonated with many. Her brain has reportedly adapted so fully that she now dreams in Korean, with her mother speaking the language in her subconscious.

Online reactions have been mixed. While many praised Tsuki's incredible work ethic and refusal to give up on her dreams, others raised concerns about the arrangement itself. Some questioned whether her parents made the right call allowing a 13-year-old to live abroad with minimal contact, even for a limited period. Questions about the safety and emotional toll of such isolation circulated on social media.

Still, the overwhelming sentiment tilted toward admiration. Fans highlighted her bravery and the sacrifice she made to pursue her career, with comments reflecting awe at the intensity of her dedication during such formative years.